Enhanced Ras activity promotes spine formation in synRas mice neocortex

Ulrich Gärtner, Alán Alpár, Julia Behrbohm, Rolf Heumann, Thomas Arendt

Research output: Contribution to journalArticle

18 Citations (Scopus)


The effect of enhanced Ras activity upon dendritic spine formation has been investigated on pyramidal cells in the adult neocortex of synRas mice over-expressing Val12-Ha-Ras specifically in post-mitotic neurons. For quantitative analysis, commissural neurons of layers II/III were retrogradely labelled with dextran amine. In synRas mice, spine frequency on several orders of basal dendrites and apical oblique branches was significantly increased. Whereas density on basal dendrites was overall augmented, on apical dendrites, distal regions were most affected. The proportions of different morphological types of spines remained unchanged. It is concluded that Ras might be critically involved in mechanisms that mediate and regulate dendritic spine formation in the adult brain.

Original languageEnglish
Pages (from-to)149-152
Number of pages4
Issue number2
Publication statusPublished - Feb 8 2005


  • Adult brain
  • Mouse
  • Neuronal plasticity
  • Neurotrophin
  • Somatosensory cortex

ASJC Scopus subject areas

  • Neuroscience(all)

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